Hi @Stefan Schippers I'm trying to generate this curve using Xschem and ngspice but I couldn't find a way to plot the frequency

Hello, When trying to get the back annotation feature working. I have in place:

* Is this option needed, this option causes the ngspice error:
* "Warning from checkvalid: vector @m.xm1.msky130_fd_pr__pfet_01v8[ib] is not available or has zero length."
* .option savecurrents
.save all

When the

.option savecurrents

is specified, this causes no new RAW file to be created, but an error to occur, is this usage error or a bug ? When I attempt to "load waves" with code.sym "xschem raw_read $netlist_dir/testbench.raw tran" no error is shown, no indication an action was performed occurs and no update to visual seen. When I use the menu "Graphs -> Annotate Operating Point ... -> pick RAW file -> OK" the visual updates with question marks "? ?" the only data that is updated are the ammeter.sym and spice_probe.sym I added to the design. None of the transistors show values. I think I need to inject a wave graph into the schematic view, to provide an X axis time reference to show sample for, can''t see an obvious design/*.sym to insert for this, so hunting for a project with that configured. Also what is the best symbol to be using to inject test points for data collection (I and V for example), ideally with a quick toggle button list to disable/enable (without need to rework the schematic, to remove the injected symbol when you want to disable it). This would then modify the netlist creation and ngspice config accordingly to the disable/enable state of the individual test point. Also after some time in usage of xschem the application refuses to take any more mouse click input to select items in the main design area. Menu items work ok, a restart always fixes it. Is this is known matter maybe with Tk/X11, using Linux/Xwayland ? Thanks

Hello guys, i have two file "lef" and "def", how can i visualize them in magic? I tried both command, "lef ready <file>" and "def ready <file>", but i get this error...

Hi, I'm trying to generate a custom openram macro for sky130, and I'm getting the familiar

ERROR: file design.py: line 46: Custom cell pin names do not match spice file:

error. The issues and chat history I've searched referencing this indicate the skywater pdk is not installed correctly, however, I ran

make install

, it looked successful, and I have the following files

ls technology/sky130/gds_lib/
sky130_sram_1kbyte_1rw1r_32x256_8.gds  sky130_sram_2kbyte_1rw1r_32x512_8.gds
sky130_sram_1kbyte_1rw1r_8x1024_8.gds  sram_1rw1r_32_256_8_sky130.gds

Hi! 1. What are the typical use cases for utilizing APB over AHB and vice versa? 2. What determines selection of AXI over APB/AHB? Is it just operating frequency or are there some other parameters? At what frequency does we use APB, then AHB and then AXI? 3. Why do we use bridges and not use AXI all over with some modifications like using AXI-Lite where required? I have gone through their specs but haven't really found satisfactory answers to the above or, I could have missed them. Would really help if someone answers it here! Thanks, in advance!

I realized that the sky130 pdk has a deep N well for isolating nfets. Has anyone done anything with this? I searched the channel but did not see any talk about it.

How can I integrate sky130 with cadence tools

@Stefan Schippers: Here's a new question for you. I've been working on this CACE system for automatic characterization. It was developed on the Efabless platform years ago when we were using Electric for schematic entry and hadn't heard of xschem. So I was trying to introduce variables and equations into the netlists to be resolved by direct substitution. For the variables I used the usual standard of

${name}

; for the equations I introduced a stack notation with the odd looking variables

${*}

${/}

${+}

${-}

and suchlike; so

${A} ${B} ${+} 2 ${/}

would resolve to

(A+B)/2

. This notation can get rather cumbersome. I think I can replace the whole system with just a call to xschem to generate a netlist if I pass all the variable names to xschem, but I would also need to replace the stack notation stuff. I think it is a straightforward matter of replacing it with calls to

tcleval

. I've attached a schematic for a CACE testbench. How should I write the device parameters with

tcleval

(or any other syntax that works) so that xschem would do the work of variable substitution and produce the output I'm currently doing with python code inside CACE? (FYI, the variable notation on pins is also being handled inside CACE but I do not think this is needed and I can dispense with it altogether).)

Hi. Is it possible to import a verilog file mapped with

yosys

to standard cells into

xschem

? I have an example where i have mapped a simple counter to the sky130 standard cells, and i want to perform an analog spice simulation in

xschem

. Here is the synthesized counter.

Hi! Can someone please help me with the following?